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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'f761cb727aae105ad5958c050f6aef95633b70f193ba7033e28a2b37237377b1' 
  AND token = 'S1pu/X2TTyn13VEoyFCx0VlLI1URZTLAg1lntLmbElk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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