Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68cc7afb1bb6e021acf58666810143aa23d1d9568b65a6c68aa96d6c0fb62a92' 
  AND token = 'UFIC19V+z72Cin3/R2ymPbT+IjpbYWw88SiblvEDgwE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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