Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7426ce3307fa0d2b5f6b78e8bd089d0476463ee607a9b739fd4b919b2c739a0' 
  AND token = 'uvS8c/e7RH+QoYx7gWDLKBO22qxhGS2IikIGg8Tt4pc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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