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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '9ab263eb844fa18d705c2f0ef4910a4c4168599ca86bac26abb3310082dd637c' 
  AND token = 'rdlPy7nukLEIdN0YmOcnRl59z1e20toqiauuMoipOvo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}