Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e546c32ad439f2ff9ca6ae520208d846fe636b8c1e2c68ab16677c971d69000' 
  AND token = 'XQX08cB5Ne5Rz7y4SrA4ohyiaCu1rxZ2KRc4Vs7/ncc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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