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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '01287b3cce698bfb4be62fad79b8acf8f2691462587756c65c881dfb7f832ab6' 
  AND token = 'Yn/rb42mYfAWtnymbvcRwWt3g8BY7/Qn4FVuDmgL8yo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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