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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '28ef949c6c01780e6be5072ebf6a21ac4c4051fc32d647747400c7fff403496e' 
  AND token = 'l4UlV2bnccgpbKhgkNFhLctDNtLF4l7RfNibR2X/EGA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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