Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fed8ceaeecc08f0aa6915f82fc555ebd84210e6efc22a037d6ec4fff7fadb2c3' 
  AND token = 'ZjM18vA9gzwwcDku2vt4d0AXuTiFb14/W+HeCIJeut8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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