Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6df7337ded3417b1edc411b1ef0198c407948b9b76202e51c7f69cd678a80c58' 
  AND token = 'dF6sivz+FXbo49fegWOv7QlQKvoL7tl5z/2Z+Af/wrk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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