Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c793bc3bfa25bd2f58e23e9beff809dfd6ba9f6531028d6a0cdb903574497f39' 
  AND token = 'Z3JjRYokGuzdpcXR4+rAEtp6yI+yrRBopJVBInEiKDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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