Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4aec9a83acc81e485fdab5c320d600f47673994928497eb872afb7fad91051a1' 
  AND token = '574hkuqHqdOkSrYrnap8LzAsmVTq2oYPSA/KbVsJu7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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