Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd74862104a77e7dd4943c71e10488c09b792df3ed91dd685d0ad62f3a576da05' 
  AND token = '3dz4CpJnZJ+Zxhn4kBTKLNXY2j7hiOMxM8YJOJ4TIWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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