SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'db3436f1544a589d1395908f852f18d546a6f30ece8401ce7cc9a91825cd2599' 
  AND token = 'vY7oQreYnzhyC7H1rcKysmGLxJMGNBdiEV5+2z/t51Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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