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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e450dde0850a172a05cd2ad125d2f24e7680f91e2d10e7b4941f03ce87b6f828' 
  AND token = '+y29G3QXqoDCCMzdBa8imw9zkt3MvJscu8p29p6sVEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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