SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '5c395b5657f2fbd641ecc3ef4e363d1188e3ab58f0c74fb820244e796328f8da' 
  AND token = 'OT0KM+xvPhcm1dA4Uz2umBk4eYgLGs6nha5wDbF0K7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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