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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '5909b85edcbf14e977ef73b92f8ff5f60ccdc1acc57382286c6776e2dd8abac6' 
  AND token = 'WYI9c9MTUDFErU+xwBmaya0M4FsG5kb3PBRBS7aFFU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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