Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c7f68ad3a040c1b960af77760599750a6b0370fe5d588b19d3830e684c1923c' 
  AND token = 'Pu4xqEmhOrF70Ki1Oe27dgjqYim7aAT//Ugeg+dyeoI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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