SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '22ef46742b52123255a32b31d6087f3bc45ff2a921a650e9ec96585d8fc326ac' 
  AND token = 'XM65eBiglJG3ov/xOViUgRwdgEA1p+m18GtDoLN9NEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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