Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '431b5965f33c4cf2286735d5c3459791b6c4ee5b6d09cd05a9699b186c856aa4' 
  AND token = 'YQZlkCVGDergVNutCGYRdDv/bT190eLPrCdV6UrD5fc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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