Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '624ded6abc5e03db01be093597e8146f5ec43e2f22cb829fe657afbf792e4bb8' 
  AND token = '0/0Jx+O5QfMPjK0QRKupbwCwAU4lfqegnPU243rKif0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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