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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'f2db13ad8728e3e56fbb7fcd4b1d24c647bcb897933d7615e90917e398c59a6f' 
  AND token = 'OZ9S015T4YKO4Nnda16+ep2E8amkRDbK1xf1s8Qymw4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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