Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c3ddf59314e23b1afd4199e5ef090785375d01695e4064e0c79e3ce3c459341' 
  AND token = '8bL0hdJHm+ageF+66psu2oZjdsPLf20KEDDbbclj51I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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