Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd8c2e289ed5145fa3531233f95f1d9a741f76462b7fd7336430f3e3b0cbac1f' 
  AND token = 'WG3kupxxnPoHCGZu4LaMfnrZ/FvCNHFqk/2bsCeAlMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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