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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'ad30d7c8c511a5781c623def19e4a03774ba15dbc95743b4285fec6d62f237b9' 
  AND token = 'n8P+Q36MzCXvjdmafz1DVSMBL1EiM8W2mputIK+8YPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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