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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '66a1fa2c754eedd8512864023d9e58781febae75baac8c41b49ddd27846169a8' 
  AND token = 'Fh/Y8BCEy6lFSQjVSrFp5lTyK+TXoTfMaqqPktE5lAw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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