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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'c813ee7c2b631e4ea6c7f4eb6e55959b5f419cf9bb77ef6e55c0367bc2bdd1ec' 
  AND token = 'S+sa3rFZajdeQTYSaV6xEt8mxJExBQoivjqwndrFzi4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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