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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'ccac68e976098c7d2a404fa5788d2dc536ce7a8aa68f954ddfbeb063374de468' 
  AND token = 'QCeAB1f3iOoRXzF9pTqlMyxMkE6uZaJUM3TiMgIA+hI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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