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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e493e5d55b43927ee31bd67579bcd37488137dc7e9a09bf65cd89081a5a430a9' 
  AND token = 'zYP2Irx9JsigAeBgbFtWKLnYrIRpiMiYgucYfFi2T+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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