Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b913507e00ba783806f57c1e4e303a2777e3a6dfcf2d1c650305f6569caa439' 
  AND token = 'KRjEzMk9xJsVxTiGAupjzi/XeSFzyN2e305oqZ2UCfk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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