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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'c88cc11f1a5e31360c36e40d9be7270caeb99d31e93a73abd65a3c349bbe1558' 
  AND token = 'Db34DbqiRvOgxolUF7IjS70EEqxvLHM+js9A4Ggrd9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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