Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b75f356c0a7e61de61894ca04906b6fcabea68fa2c5b405d88b69f65fa9ad19c' 
  AND token = 'y7mrx3SlWqYM8xb1i7I7raUlv4Dsb++cvhEjESOJjFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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