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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'dc6f522bf8cff6aca56762bc34fdb0a23c2adc7be54e9fcd81dc1e602f3af528' 
  AND token = '4PVVLLz7+W0AzDSNqcmlimzbP/Cy2yRT6km3zK9LAPM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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