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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '5e7bf5ee68a29ccad039351e4f588bf48a1b770feaebfd64139133184610d32b' 
  AND token = 'w6qsNhvOVkM7sQihuBInteXDvTa2Qn1J+y9Byeprl9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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