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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '1888bac133553bf464e7e6ad6c203358d52a055c1c73efb0affe567287d89251' 
  AND token = 'pF6tZq7QA02zNai7jD4QtmzIkMid4Y7+whBPpLUOFU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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