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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '0d8309fa70c90cf388d2f7ffdde3afecda829eedf52650534caa1f8e9ea55320' 
  AND token = 'yuAMVMyU/ToBuR/Db8zef41a3jIdH9mQ2hOuyGmNh18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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