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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '78386acc6ea9d69e844de7cf913d340b96e3fbe00ec757725e6d1a638b5c0d64' 
  AND token = 'Ao9VjA6p8t9dD6cMPt6WG/7EidzjwNxnrDHHp1RUAvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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