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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '54324e9caccda11a0b720ff80112fa068839fb500e49043427862b27440f0c23' 
  AND token = 'UqFFMBMXRqxu1ImmFns5VK45ttJ7EoFJ8y7c4s7G5bE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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