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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '765235cc127950eed3455617349280dc26fe706f5d5602507558e8e5fe1627f9' 
  AND token = 'Ms3z/9IVlEVRBoKdw7JKjw8L1f6Hf+6itWov4Fz8nMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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