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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '11eb37c54e4ab21797af329dcc76d235bff8ca391d44370b7151393bcc06ef23' 
  AND token = 'qpU6tDlpu4jCkOq8x9/DmsxbY8qzwAD+wBHqIaOyDdU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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