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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e7797ce049f24e2b4bb4c4bf6bb9c66889552a436a551c219de4b00b1f2a6a19' 
  AND token = 'oRZsakih4HI9guAhTJplnY4E/Rx+VxDcejg8/K2kUxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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