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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7f33e94a3d3f4b577ad42e8f6f409bfab28193d45eb8f777c7a3f2bba71baf45' 
  AND token = 'jlYRF7PxjyDZ2dVdSQL/a4kEnZ6hi/LIx19eKPc2eso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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