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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'f67614f363f9e24c97761e3b21af6dbd399d815f896de6f8023d39b76b9ec0e5' 
  AND token = 'TJuX1+uhj29+cVEfxpDN5VXeX0QPD3RxRZ3jB6lveeo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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