Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81f73ec2d1d6e5b9a7d0a12c4eab99e39af0dfaaae395c2e709ed62028ccfbc6' 
  AND token = 'h0MKMyfH7H35hA+j++WUe76n44teGHSLtwJsSMoJOKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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