SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '98267d37d63840fa2249c8d9f19470a4dabe45a5806a810408ccce82e511b1b6' 
  AND token = '1D+jKslpbWhYLlLuRKW/+hGg9I7Ap5xGmnoeLelphiE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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