Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdff75de59b66af74209a2048a2944aa63cb53ea95d6f203f05dbb0d580fc307' 
  AND token = 'ArtYsPXrtq0S11NOtiqjfCJg6M2HBz6h5oQDVXdDIQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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