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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'b1761abc44290abd35d436fd848c2dd25b75dffa56f9b14a50d73a98af284c93' 
  AND token = 'Fx3zKLozog2bRkV2Jooua3GAPP5sAMAtbJc9wQo1Z7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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