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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '2cbc8fa9417a393c81208596aa11f9417abaa06cccd8d907180d37f807fe1e21' 
  AND token = '+rueN5F95k0kTFDGQMbw6ELBzAS7enGz6wOejvMHS48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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