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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'bbbae46293c7d4336926597e786b874891495c3cdb03b555a33c6328d96879e4' 
  AND token = '1Fv8ExuKMyWi+1ZOgUMC9Rkzb7F030O9XxBmBSkd77M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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