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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '6559458ba4df2b21c19bce286ec045b9de19ca3ce3331d14d70e7169e268cc84' 
  AND token = 'nOW9Wai6rmCBswuiZKpoQUmeyf+fHw+PJ6kn1FAPy8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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