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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'ec12092fa080dea47a353f52ee8f105397ad519a15cf2520914d15b1afe15edd' 
  AND token = 'oFgQO/9dw4hK7MmxFTYj0L1ngq3RtiugIYTUiGy0Drk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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