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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e1291c2823fee44f7ef191a9366b5832edd82f154539af734925428c8aa8383f' 
  AND token = 'LO55UkwiC3Yo9063gCckoMiD8j//QsQ4yLe0sGJK4mg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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