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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '529e779abad1d1064be7d3fdd55eb4b4cba062cfdc12e32b4469046637ff712c' 
  AND token = '6wRTxV8YWdHxrkNk4gT+SR1e+Ykzsq/ATlESnB6Sd9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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