Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6fbd60758aba2c1351abd90a78388f9ceca3c29cc40d1d1f015fa3831f3188f' 
  AND token = 'r3Qpy1/TY4OSACb0SEVIUW2t9hbAJ/Xy76roCYN9s7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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