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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'f668a6b341773b5b71c2bacf78458a7c122cec8f5b841aec5605e040d1e5238b' 
  AND token = 'Zdkvj6a6GcahF3IFZtozx6GJNcHx655XT7WZtC4xxQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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