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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd5ac3fb982f8a2eb80d645ee67472f08865a3da06823183951fdac4cdecb6fc1' 
  AND token = 'DdTn+LQdx6g7oj5dw+5+U0GS8Kfj//QmkR0FsfeP144=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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