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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '1b2c3685b6550babc11e33109293357d3faa4a59a2ba0a393defe211f2e34fe1' 
  AND token = 'LihE2YROz5zcio3Whv60QSmH6BeuWYYu2zhOgeNyVRE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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