Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b08d71f4cebbcdfe5923de51415c2aadb7a0d6ffc6a39a3166b3e0831ec5da88' 
  AND token = 'hMqrs0mwiV/PjGjRId/QoE9/NjdnN70sUPhaYmhw+5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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