Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fedc5795b7b3e0cb46683ce9861d4a98f33a884aaa03ad2d4c0eefb9299de697' 
  AND token = 'lZ85bVnOfHkJRDnM3Qxjg+KdsgMuGi2uZkH4n1mC0h0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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